Renesas H8/3067 Series User Manual page 647

• User program mode
1. Initial state
(1) The program that will transfer the
programming/ erase control program to on-chip
RAM should be written into the flash memory by
the user beforehand. (2) The programming/erase
control program should be prepared in the host
or in the flash memory.
Programming/
erase control program
New application
program
H8/3067 Group chip
Boot program
Flash memory
Transfer
program
Application program
(old version)
3. Flash memory initialization
The programming/erase program in RAM is
executed, and the flash memory is initialized (to
H'FF). Erasing can be performed in block units,
but not in byte units.
New application
program
H8/3067 Group chip
Boot program
Flash memory
FWE assessment
program
Transfer program
Flash memory
erase
Host
SCI
RAM
Host
SCI
RAM
Programming/
erase control program
Figure 18.4 User Program Mode (Example)
2. Programming/erase control program transfer
When the FWE pin is driven high, user software
confirms this fact, executes the transfer program
in the flash memory, and transfers the
programming/erase control program to RAM.
Host
New application
program
H8/3067 Group chip
Boot program
Flash memory
Transfer
program
Application program
(old version)
4. Writing new application program
Next, the new application program in the host is
written into the erased flash memory blocks. Do
not write to unerased blocks.
Host
H8/3067 Group chip
Boot program
Flash memory
FWE assessment
program
Transfer program
New application
program
Rev. 4.00 Jan 26, 2006 page 623 of 938
Section 18 ROM
SCI
RAM
Programming/
erase control program
SCI
RAM
Programming/
erase control program
Program execution state
REJ09B0276-0400